using System;
using System.Runtime.InteropServices;

namespace SvnLogs
{
    public class ServiceInstaller
    {
        #region DLLImport
        [DllImport("advapi32.dll")]
        private static extern IntPtr OpenSCManager(string lpMachineName, string lpSCDB, int scParameter);
        [DllImport("Advapi32.dll")]
        private static extern IntPtr CreateService(IntPtr SC_HANDLE, string lpSvcName, string lpDisplayName,
        int dwDesiredAccess, int dwServiceType, int dwStartType, int dwErrorControl, string lpPathName,
        string lpLoadOrderGroup, int lpdwTagId, string lpDependencies, string lpServiceStartName, string lpPassword);
        [DllImport("advapi32.dll")]
        private static extern void CloseServiceHandle(IntPtr SCHANDLE);
        [DllImport("advapi32.dll")]
        private static extern int StartService(IntPtr SVHANDLE, int dwNumServiceArgs, string lpServiceArgVectors);
        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern IntPtr OpenService(IntPtr SCHANDLE, string lpSvcName, int dwNumServiceArgs);
        [DllImport("advapi32.dll")]
        private static extern int DeleteService(IntPtr SVHANDLE);
        [DllImport("kernel32.dll")]
        private static extern int GetLastError();
        [System.Runtime.InteropServices.DllImport("Kernel32")]
        private extern static Boolean CloseHandle(IntPtr handle);
        #endregion DLLImport

        /// <summary>
        /// This method installs and runs the service in the service control manager.
        /// </summary>
        /// <param name="svcPath">The complete path of the service.</param>
        /// <param name="svcName">Name of the service.</param>
        /// <param name="svcDispName">Display name of the service.</param>
        /// <returns>True if the process went thro successfully. False if there was any
        /// 
        public static bool InstallService(string svcPath, string svcName, string svcDispName, bool autoStart, bool startNow)
        {
            #region Constants declaration.
            int SC_MANAGER_CREATE_SERVICE = 0x0002;
            int SERVICE_WIN32_OWN_PROCESS = 0x00000010;
            int SERVICE_DEMAND_START = 0x00000003;
            int SERVICE_ERROR_NORMAL = 0x00000001;
            int STANDARD_RIGHTS_REQUIRED = 0xF0000;
            int SERVICE_QUERY_CONFIG = 0x0001;
            int SERVICE_CHANGE_CONFIG = 0x0002;
            int SERVICE_QUERY_STATUS = 0x0004;
            int SERVICE_ENUMERATE_DEPENDENTS = 0x0008;
            int SERVICE_START = 0x0010;
            int SERVICE_STOP = 0x0020;
            int SERVICE_PAUSE_CONTINUE = 0x0040;
            int SERVICE_INTERROGATE = 0x0080;
            int SERVICE_USER_DEFINED_CONTROL = 0x0100;
            int SERVICE_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED |
            SERVICE_QUERY_CONFIG |
            SERVICE_CHANGE_CONFIG |
            SERVICE_QUERY_STATUS |
            SERVICE_ENUMERATE_DEPENDENTS |
            SERVICE_START |
            SERVICE_STOP |
            SERVICE_PAUSE_CONTINUE |
            SERVICE_INTERROGATE |
            SERVICE_USER_DEFINED_CONTROL);
            int SERVICE_AUTO_START = 0x00000002;
            #endregion Constants declaration.

            try
            {
                int dwStartType = SERVICE_AUTO_START;
                if (autoStart == false) dwStartType = SERVICE_DEMAND_START;

                IntPtr sc_handle = OpenSCManager(null, null, SC_MANAGER_CREATE_SERVICE);
                if (sc_handle.ToInt32() != 0)
                {
                    IntPtr sv_handle = CreateService(sc_handle, svcName, svcDispName, SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, dwStartType, SERVICE_ERROR_NORMAL, svcPath, null, 0, null, null, null);
                    if (sv_handle.ToInt32() == 0)
                    {
                        CloseServiceHandle(sc_handle);
                        return false;
                    }
                    else if (startNow)
                    {
                        int i = StartService(sv_handle, 0, null);

                        if (i == 0)
                        {
                            System.Diagnostics.Debug.WriteLine("Couldnt start service");
                            return false;
                        }
                        CloseServiceHandle(sc_handle);
                        CloseServiceHandle(sv_handle);
                        return true;
                    }
                    else
                    {
                        CloseServiceHandle(sc_handle);
                        CloseServiceHandle(sv_handle);
                        return true;
                    }
                }
                else return false;
            }
            catch (Exception e)
            {
                throw e;
            }
        }
        /// <summary>
        /// This method uninstalls the service from the service conrol manager.
        /// </summary>
        /// <param name="svcName">Name of the service to uninstall.</param>
        public static bool UnInstallService(string svcName)
        {
            int GENERIC_WRITE = 0x40000000;
            IntPtr sc_hndl = OpenSCManager(null, null, GENERIC_WRITE);
            if (sc_hndl.ToInt32() != 0)
            {
                int DELETE = 0x10000;
                IntPtr svc_hndl = OpenService(sc_hndl, svcName, DELETE);
                System.Diagnostics.Debug.WriteLine(svc_hndl.ToInt32());
                if (svc_hndl.ToInt32() != 0)
                {
                    int i = DeleteService(svc_hndl);
                    if (i != 0)
                    {
                        CloseServiceHandle(sc_hndl);
                        CloseServiceHandle(svc_hndl);
                        return true;
                    }
                    else
                    {
                        CloseServiceHandle(sc_hndl);
                        CloseServiceHandle(svc_hndl);
                        return false;
                    }
                }
                else return false;
            }
            else return false;
        }
    }
}